Which term refers to myocardial relaxation or diastole?

Which term refers to myocardial relaxation or diastole?

• A. Inotropy
• B. Chronotropy
• C. Dromotropy
• D. Lusitropy

Answer: (D)

The main concept here is how the heart relaxes and fills during diastole. That property is called lusitropy. Lusitropy describes the myocardium’s ability to relax after contraction and accommodate blood during filling. Positive lusitropy means the heart relaxes more quickly or completely, improving ventricular filling, especially when heart rates are high or diastolic time is shortened. In contrast, the other terms describe different cardiac properties: inotropy is about the strength of contraction, chronotropy about heart rate, and dromotropy about the speed of electrical conduction through the atrioventricular node. So the term that refers to myocardial relaxation or diastole is lusitropy.

The main concept here is how the heart relaxes and fills during diastole. That property is called lusitropy. Lusitropy describes the myocardium’s ability to relax after contraction and accommodate blood during filling. Positive lusitropy means the heart relaxes more quickly or completely, improving ventricular filling, especially when heart rates are high or diastolic time is shortened. In contrast, the other terms describe different cardiac properties: inotropy is about the strength of contraction, chronotropy about heart rate, and dromotropy about the speed of electrical conduction through the atrioventricular node. So the term that refers to myocardial relaxation or diastole is lusitropy.